(17B/19B) GPM: initial payment

[Gil]

Sorry, Albert, but I am starting to be confused now!

PV 60000
FV 0
IG%YR 7.5%
with growth of the payments during 5 years, from years 2-6, then all the following payements
remain constant at level of year 6.

But, in your example, what is your compounding/YR, C/YR?
And what is here, for your calculation, the annual nominal interest, I%/YR?
And payments always at the end/beginning of the period?

For C/Yr = 3, P/yr=12, end-payments,
I find -468.087113114.

Until your last reply, Albert, I was pretty sure of my way of calculating, only using — based on the annual given nominal rate I%YR — the corresponding effective rate, in my case here r=[(1 + 12/3/100)^3]^(1/12)=1.00985340655, for monthly payments.